[PATCH] D105811: [flang][driver] Delete `f18` (i.e. the old Flang driver)

[Andrzej Warzynski via Phabricator via llvm-commits]

awarzynski created this revision.
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This patch removes `f18`, a.k.a. the old driver. It is being replaced
with the new driver, `flang-new`, which has reached feature parity with
`f18` a while ago. This was discussed in [1] and also in [2].

With this change, `FLANG_BUILD_NEW_DRIVER` is no longer needed is deleted
as well. This means that we are making the dependency on Clang permanent
(i.e. it cannot be disabled with a CMake flag).

LIT set-up is updated accordingly. All references to `f18` or `f18.cpp`
are either updated or removed.

[1] https://lists.llvm.org/pipermail/flang-dev/2021-June/000742.html
[2] https://reviews.llvm.org/D103177


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D105811

Files:
  flang/CMakeLists.txt
  flang/docs/ImplementingASemanticCheck.md
  flang/docs/Overview.md
  flang/include/flang/Frontend/CompilerInvocation.h
  flang/include/flang/Frontend/FrontendOptions.h
  flang/lib/CMakeLists.txt
  flang/lib/Frontend/CompilerInvocation.cpp
  flang/test/CMakeLists.txt
  flang/test/Driver/help-f18.f90
  flang/test/lit.cfg.py
  flang/test/lit.site.cfg.py.in
  flang/tools/CMakeLists.txt
  flang/tools/f18/CMakeLists.txt
  flang/tools/f18/f18.cpp
  flang/tools/f18/flang
  flang/tools/f18/flang.in
  flang/unittests/CMakeLists.txt
  llvm/CMakeLists.txt

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